OFFSET
1,2
COMMENTS
t(n)= (2^(2*n)-1)*2^(2*n)*B_n /(2*n)! B_n: numbers of Bernoulli, sequence 1/6, 1/30, 1/42, 1/30, 5/66, ... example:n=2, a(2)= 1/det|1, 1/3|1/3, 2/15|= 1/(1/45)=45 See A001906 for the definition of Hankel transform.
FORMULA
a(n) = (4*n-3)^1*(4*n-5)^2*...*3^(2*n-2)*1^(2*n-1).
a(n) = A057863(2*n-1). - Vaclav Kotesovec, Oct 16 2015
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Philippe Deléham, Dec 31 2003
STATUS
approved